This paper introduces a bivariate version of the generalized accelerated failure time model. It allows for simultaneity in the econometric sense that the two realized outcomes depend structurally on each other. Another feature of the proposed model is that it will generate equal durations with...

This paper investigates determinants of informal economic activity. We present an equilibrium model of informality and test its implications using a survey of 48,000 small firms in Brazil. We define informality as tax avoidance; firms in the informal sector avoid tax payments but suffer other...